Home Office Tax Deduction

If you work from home for a business, you can deduct a portion of home running costs proportional to the space used exclusively for work. Use this calculator for accurate, instant results.

The calculator uses the standard published formula for home office deduction. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

This calculator works with inches, dollars, percentages. You can enter values in the units shown — the calculator handles all conversions internally.

The core formula is: Home office % = Office size / Total home size x 100. Each step in the calculation is shown so you can verify the result manually.